A requirement for music to play is software for the format you are trying to play. For instance, if you are trying to play an .mp3 file you must have software that will play .mp3 files. If you are trying to play RealAudio files, you must have a program that will play RealAudio files. If you are trying to play MIDI's, you must have software for MIDI's. These programs can be downloaded from the internet, usually for free. The site you are going to should have more information as to what type of file it is trying to play, and based on that the correct program must be installed in your browser to play that file.